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What is new about the upgraded moriarty COLOUR guide that replaces the original foldout HTP colour chart from my book COLOUR - the definitive guide?

The original HTP chart had 36 hue panels, 9 tonal (value) strips & 10 variations of purity (saturation) in all, 3240 colours.  This was made independently of the original colour wheel and the two did not match throughout.  

The three-section colour wheel that accompanied the plotter, was made using Cyan (C) magenta (M) and yellow (Y) - no black (K) was used in any of the colour chips.  However the original HTP chart was made using a well-known computer graphics program and black (K) was automatically introduced into a high percentage of the dark and impure colours.  Some of our panels were upgraded to a no-black standard and the superiority of these was clearly obvious.  

Creating the HTP colour swatches ranging from bright and pure, progressing to dark (and or) impure ones, made with the cyan, magenta and yellow alone, mathematically, is quite a complex task.  To do this so that the progression of steps is in line with the nature of pigment blends is more complex still, a straight algorithm being invalid.  I have developed a series of curved algorithms, the curve of the algorithm changing for each tone with a further modification to accommodate the shifting chroma point for each hue. For instance yellow reaches its fullest chroma very close to white, blue, close to black, whilst red, green and magenta are closer to the centre of the tonal range.  

The HTP hue panels we did some time back, show that whilst this is a challenging task it is none-the-less very achievable.  With a committed and patient assistant, such as I had with Rosemary Constable, the task could be completed, hopefully later this year.  The results, with those we have already done, are clearly superior to the first printing, being consistently more vibrant throughout.

The new moriarty COLOUR guide that we are intending to produce will have 36 hue panels as before and ten variations of purity, but it will have an extra tone strip at tone 9.5 to accommodate very light tones in all hues and purities.  These extra light tones can be considered as near whites (except for yellow, which is brilliant at this tone) and they have an important place, not only in art, but also in a number of industries including textiles, house paint and paper sellers.  

Because our system is mathematically consistent and understandable in all three variables: hue, tone and purity (HTP) colours between those shown on the chart can be quite easily defined. We can say then that any achievable colour can be defined precisely with the moriarty COLOUR guide, in both RGB and CMY (+ extra inks as required by different industries.)

Finally, the new moriarty COLOUR guide will match the RGB colour wheel as closely as possible, appreciating that colours created with mixtures of pigment can not equal the intensity of colour mixtures made with RGB (light).  Also, and this is critical, mixtures of complementary pigments (subtractive) progress toward grey more quickly than with light (additive).

MM July 2016

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Merv Moriarty - Artist Education
'Many Swans' 1476 Sapphire Coast Drive, Wallagoot, NSW 2550 | Phone: 02 6494 5144
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